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clang in NDK needs "as" and "ld" from gcc directory via
option -gcc-toolchain, which used to be 4.6.  Change it
to use 4.7 because recent clang may generate instruction
such as "vmrs APSR_nzcv,fpscr" not understood by binutils-2.21/as
in gcc 4.6 directory.

Change-Id: I43d0e13904625c5f8c7cbba545cc3003f0a77d80